Oncorhynchus mykiss (Walbaum, 1792)
Description
Dorsal spines (total): 0; Dorsal soft rays (total): 14 - 16; Anal spines: 0; Anal soft rays: 6 - 12; Vertebrae: 60 - 66. Diagnosis: Body elongate, somewhat compressed especially in larger fish. No nuptial tubercles but minor changes to head, mouth and color occur especially in spawning males. Colouration varies with habitat, size, and sexual condition; stream residents and spawners darker, colours more intense; lake residents lighter, brighter, and more silvery. Caudal fin with 19 rays (Ref. 2196). Differs from Oncorhynchus gorbuscha by having the following unique characters: anal fin with 6-9½ (usually 8½ ) branched rays; 115-130 scales in midlateral row; 16-17 gill rakers; breeding males lacking hump; juveniles lacking parr marks; wide pink to red stripe from head to caudal base, except in sea-run form; and juveniles with 5-10 parr marks (Ref. 59043).
Common Names
Taxonomic Hierarchy
Kingdom: Animalia
Phylum: Chordata
Class: Teleostei
Order: Salmoniformes
Family: Salmonidae
Genus: Oncorhynchus
Species: Oncorhynchus mykiss (Walbaum, 1792)
Climate Zone
Biology
Inhabit clear, cold headwaters, creeks, small to large rivers, lakes, and intertidal areas (Ref. 86798). Anadromous in coastal streams (Ref. 5723). Stocked in almost all water bodies as lakes, rivers and streams, usually not stocked in water reaching summer temperatures above 25°C or ponds with very low oxygen concentrations. Feed on a variety of aquatic and terrestrial invertebrates and small fishes. At the sea, they prey on fish and cephalopods. Mature individuals undertake short spawning migrations. Anadromous and lake forms may migrate long distances to spawning streams (Ref. 59043). Utilized fresh, smoked, canned, and frozen; eaten steamed, fried, broiled, boiled, microwaved and baked (Ref. 9988). Cultured in many countries and is often hatched and stocked into rivers and lakes especially to attract recreational fishers (Ref. 9988).
Habitat
freshwater
Conservation Status
Not Evaluated
Threat to Humans
Potential pest
Oncorhynchus mykiss (Walbaum, 1792)